Hi there, I’m having a weird bug using Angular/Ionic. I have a mbsc-calendar housed in a page that the user gets to by selecting a tab. When I build the app in debug mode, everything is great and works flawlessly. However, when I build the app and pass in the --production and --release flags, the tab containing the calendar will no longer open. I get no error messages or anything, it just doesn’t work.
I can provide more information if needed. I haven’t seen this bug anywhere else and I’ve searched high and low so any help will be greatly appreciated. Thank you!
Hi @Matt_Wheeler 
Sorry about the trouble!
Yes, it would be great if you could provide more information about this case 
Also if you can share a working example from which we could reproduce this, that would help a lot.
A few more questions:
- What kind of tabs are you using? Ionic tabs or Mobiscroll Navigation?
- If you remove the Calendar, does the page render?
I can’t post the code that’s currently failing because it’s enterprise code, but I’ll see if I can start a project from scratch and get it to fail.
I’m using Ionic tabs. When I remove the calendar, the page renders fine. I also tried adding the calendar to other tabs, using the most basic configurations, and those other tabs then would not load. I’m using Mobiscroll 4.10.3, and Ionic 4.11.1.
Totally understand 
We know a bug with angular’s build optimizer, which, in production mode, removes unused code from the final bundle. Unfortunately, it also removes code from Mobiscroll which is actually needed.
I did not know in which exact version was it fixed, but updating the @angular-devkit/build-angular package to 0.803.22 fixed the issue for me:
“@angular-devkit/build-angular”: “~0.803.22”
Please let me know if this solves it in your case as well.
I think this is the issue. In a blank project with that version of the build optimizer the tab loads fine. However, in my project I’m using Angular 7 and that version of the build optimizer requires Angular 8. I’m attempting to update and running into other problems so I can’t let you know for sure if this is the fix, but I think it’s pointed me in the right direction at least so thank you!